docs: def import_file(filename):
      """
      Imports the commodity prices from the given .csv file.
      """
      #file_path = os.path.relpath(filename)
      file_path = os.path.abspath(filename)
      log(DEBUG, "Loading prices from %s", file_path)
  
      prices = __read_prices_from_file(file_path)
      with BookAggregate(for_writing=True) as svc:
          svc.prices.import_prices(prices)
  
          print("Saving book...")
          svc.book.save()